Seems that Youtube shut down their live stream after he said it and as far as I know he hasn't addressed his comment as of yet. Zealotry is a dangerous game. The Irgun taught us that. Having a strong opinion about your set of beliefs is admirable to a certain point but when you start to even joke about committing mass casualty events in public you're probably due a vacation, a little 'me-time' to sort out just how far off the rails you've strayed.